Percentage of participants who simultaneously achieve clinical remission and at least 10% weight reduction.

Percentage of participants who simultaneously achieve clinical remission by CDAI, endoscopic remission and at least 10% weight reduction.

Clinical response based on PCDAI, and endoscopic response based on SES-CD.

Clinical response based on PCDAI, and clinical remission based on PCDAI.

The UNRS is a single participant reported item that measures the severity for the urgency (sudden or immediate need) to have a bowel movement in the past 24 hours using an 11-point NRS ranging from 0 (no urgency) to 10 (worst possible urgency). Higher scores indicate more severe urgency. Baseline Observation Carried Forward (BOCF) endpoint was defined as the baseline value for participants discontinued during acute phase and defined as the last non-missing observation in the treatment phase for all other randomized participants.

Clinical Remission based on the MMS

Clinical Remission based on the PCDAI

Endoscopic Response defined as ≥50% reduction from AMAM study baseline in Simple Endoscopic Score for Crohn's Disease (SES-CD) total score. The SES-CD evaluates 4 endoscopic variables (presence/size of ulcers, extent of ulcerated surface, extent of affected surface, and presence/severity of stenosis) across 5 ileocolonic bowel segments (ileum, right colon, transverse colon, left colon, and rectum), with each of the 4 variables scored from 0 (best) to 3 (worst) per segment, resulting in 20 individual assessments. Total SES-CD score is the sum of all 20 individual assessment scores across all the bowel segments. Scores range from 0 to 56, with higher scores indicating more severe disease.

Clinical remission was defined as a Crohn's Disease Activity Index (CDAI) total score \< (less than) 150. The CDAI measures the severity of active disease using 8 disease variables: stool frequency, severity of abdominal pain, degree of general well-being, presence or absence of extra-intestinal manifestations, presence or absence of fistula, use or non-use of antidiarrheal agents, presence or absence of an abdominal mass, hematocrit, and body weight. Each variable is assigned a specific weight/multiplier, and the weighted values are summed to produce a CDAI total score. CDAI total scores can range from 0 to 600, with higher scores indicating more severe disease.

Clinical response by patient reported outcome (PRO) defined as ≥30% decrease in stool frequency (SF) and/or abdominal pain (AP) \& neither score worse than baseline. SF (number of liquid or very soft stools) as per Bristol Stool Scale Category 6 or 7 and AP (4-point scale: 0=none, 1=mild, 2=moderate, 3=severe). Endoscopic response defined as ≥50% reduction from baseline in total Simple Endoscopic Score for Crohn's Disease (SES-CD) score. SES-CD evaluates 4 variables assessed in 5 bowel segments, each scored from 0-3: presence \& size of ulcers (none=0; diameter 0.1-0.5 cm=1; 0.5-2 cm=2; \>2 cm=3); extent of ulcerated surface (none=0; \<10%=1; 10% to 30%=2; \>30%=3); extent of affected surface (none=0; \<50%=1; 50% to 75%=2; \>75%=3); presence \& type of narrowing (none=0; single, can be passed=1; multiple, can be passed=2; cannot be passed=3). Total is sum of all scores across all bowel segments. Scores range from 0 to 56, with higher scores indicating more severe disease.

Clinical response by PRO defined as ≥ 30% decrease in SF and/or AP and neither score worse than baseline. SF (number of liquid or very soft stools) as per Bristol Stool Scale Category 6 or 7 and AP (4-point scale: 0=none, 1=mild, 2=moderate, 3=severe). Clinical remission defined as Crohn's Disease Activity Index (CDAI) total score \<150. The CDAI is an 8-item disease activity measure comprised of a composite of 3 patient-reported items: AP (4-point scale: 0=none, 1=mild, 2=moderate, 3=severe); SF (number of liquid or very soft stools) as per Bristol Stool Scale Category 6 or 7; and general well-being (0=generally well, 1=slightly under par, 2=poor, 3=very poor, 4=terrible), and 5 physician-reported/laboratory items (physical signs and a laboratory parameter \[hematocrit\]).. Total score range of 0 to 600 points.

Clinical remission at week 40 is defined as achieving a 9-point modified Mayo score for rectal bleeding=0, stool frequency=0 or 1 with ≥ 1 point decrease from baseline, and endoscopy=0 or 1 (excluding friability). Stool Frequency Subscore, based on the participant's diary and scored from 0 (normal number of stools) to 3 (5 or more stools than normal); Rectal Bleeding Subscore, based on the participant's diary and scored from 0 (no blood) to 3 (blood only passed); Endoscopy Subscore, based on central reading of colonoscopy or sigmoidoscopy and scored from 0 (normal or inactive disease) to 3 (severe disease, spontaneous bleeding, ulceration). Modified Intention-to-treat population (mITT): All randomized participants who received at least one dose of mirikizumab and who had a correctly measured Modified Mayo Score at baseline. Participants were analyzed according to the treatment arm to which they were randomized, regardless of the treatment actually received.

Clinical remission based on the modified Mayo Score (MMS).

Clinical remission at week 12 is defined as achieving a modified Mayo score (MMS) subscore for rectal bleeding=0, stool frequency=0 or 1 with ≥ 1 point decrease from baseline, and endoscopy=0 or 1 (excluding friability), excluding consideration of Physician's Global Assessment (PGA). Stool frequency subscore, based on the participant's diary and scored from 0 (normal number of stools) to 3 (5 or more stools than normal); Rectal bleeding subscore, based on the participant's diary and scored from 0 (no blood seen) to 3 (blood alone passed); Endoscopy subscore, based on colonoscopy or sigmoidoscopy and scored from 0 (normal or inactive disease) to 3 (severe disease, spontaneous bleeding, ulceration). The confidence interval of 99.88% was chosen to match the significance level.

Clearance of mirikizumab was evaluated. The PK of mirikizumab is characterized at interim analysis points using mixed-effect (population PK) modelling approaches using the available induction and maintenance mirikizumab concentration data.

Endoscopic response defined as ≥ 50% reduction from baseline in Simple Endoscopic Score for Crohn's Disease (SES-CD) at Week 12. The SES-CD evaluates 4 endoscopic variables: presence and size of ulcers, proportion of surface covered by ulcers, proportion of surface affected by disease, and presence and severity of stenosis. The total SES-CD calculated as sum of 4 variables for 5 bowel segments: (ileum;right,transverse,and left colon;and rectum): presence and size of ulcers (none = score 0; diameter 0.1-0.5 cm = score 1; 0.5-2 cm = score 2; \>2 cm = score 3); extent of ulcerated surface (none = 0; \<10% = 1;10-30% = 2;\>30% = 3);extent of affected surface (none = 0; \<50% = 1;50-75% = 2;\>75% =3); and presence and type of narrowings (none=0; single, can be passed=1; multiple,can be passed=2; cannot be passed=3). Total SES-CD scores range from 0 to 56, with higher scores indicating more severe disease.

PASI combines the extent of body surface involvement in 4 anatomical regions (head, trunk, arms, and legs) and the severity of scaling, redness, and plaque induration/infiltration (thickness) in each region, yielding an overall score of 0 for no psoriasis (PsO) to 72 for the most severe disease. For each region the percent area of skin involved was estimated from 0 (0%) to 6 (90%-100%) and severity was estimated by clinical signs of erythema, induration and scaling with a scores range from 0 (no involvement) to 4 (severe involvement). Each area is scored separately and the scores then combined for the final PASI. Final PASI calculated as: sum of severity parameters for each region \* area score \* weighing factor \[head (0.1), upper limbs (0.2), trunk (0.3), lower limbs (0.4)\]. Overall scores range from 0 (no PsO) to 72 (the most severe disease).

Clinical remission at week 12 is a defined as achieving a 9-pt Mayo subscore for rectal bleeding=0, stool frequency=0 or 1 with ≥ 1 point decrease from baseline, and endoscopy=0 or 1, excluding Physician's Global Assessment (PGA). * Stool Frequency Subscore, based on the participant's diary and scored from 0 (normal number of stools) to 3 (5 or more stools than normal); * Rectal Bleeding Subscore, based on the participant's diary and scored from 0 (no blood) to 3 (blood only passed); * Endoscopy Subscore, based on colonoscopy or sigmoidoscopy and scored from 0 (normal or inactive disease) to 3 (severe disease, spontaneous bleeding, ulceration); * Physician's Global Assessment subscore, based on the physician's overall assessment, and scored from 0 (normal) to 3 (severe disease). The total score ranges from 0 to 9 points, with higher scores representing more severe disease.